Building material.



COATING R PLASTIC.

.l. NITEDyeTATES PATENT, ()FFIGE.

MARK W. MARSDEN, OF PHILADELPHIA, PENNSYLVANIA.

BUILDING MATERIAL.

Specification of Letters Patent.

Patented Aug. 7, 1906.

Application filed January 12, 1905. Serial No. 240,829.

To all whom it may concern:

Be it known that 1, MARK W. MARSDEN, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and 5 State of Pennsylvania, have invented certain new and useful Im rovemcnts in Building Material, of which the following is a specification. 7

One object of the invention is to provide a material possessed of comparativel great tensile and compressive strengths, 0 fire-resisting properties, and of lightness in respect to bulk'and which shall be easy of manufacture, inexpensive, and constructed largely from waste materials.

Another object of the invention is to pro- .vide an expeditious method of making such material and of imparting to it, without baking, a structure such that when struck the material gives forth a metallic ring.

Other objects of the invention will appear from the following description.

The building material may be used in the form of blocks of an appropriate shape, or it may be mixed with sand and applied like plaster. The material consists of a filler containing com aratively considerable carbon and a suitab e binder, as calcined gypsum, in the proportions, by weight, of sixty per cent. more or less, of the filler and forty per cent., more or less, of the gypsum or binder. These proportions may, however, be considerabl var1ed to fit the material for different conditions of use.

To ractice the invention, I take unconsumc coal clinkers and ashes being the residue 0 .16 com us 1011 0 an hracite or grind the same so that if will pass through a 4 No. screen. To this granular material, which may be referred to as the filler and which consists principally of sharp grains or granules of silica, silicate of alumina, and unburned coal, is added a suitable binder, such as calcined y sum in powdered form. To thWeTii e i ifl'flTre may be added salt one-half per cent. and sulfate of. iron one half per cent. The chlorid'mi salt and sulfate of iron when present operate to form a glaze on the surface of the material, if it should be Heated, as by exposure to a confiagration or fire.

The ingredients are mixed with water, as will be described, and the material can be molded to the form of blocks of appropriate shape, or it may be mixed with sand and a suitable so-called retarder form hr ose, such as glue or its Wit, can readi y be obtainmn the market and is frequently used with known plasters. If the glaze consisting of salt and sulfate of iron is to be emplo ed, these are dissolved in'w'ater. Water wit or without glaze materials is employed to combine the filler and binder. The mixture can then be poured or run into suitable molds, in which it can remain for fifteen or twenty minutes and be then taken out to dry. When the'water is added and for some time thereafter, there appears to occur some chemical action, the nature ofwhioh'is not alto- 7o gether clear, but its occurrence is evidenced by the heating of the material, the temperature of which rises from that of ordinary cold water to such a degree that the material becomes as hot as can be comfortably borne by 7 5 the hand. If the material is to be used as plaster, the sand and retarder are added prior to or along with the water and the material is a plied to the walls or other articles instead I of eing run into molds or otherwise fash- 8o ioned. When it is desired to accelerate or e mass, a oneeflect a nick hardcnin of Eli per-cent. solution of HCXIIIII or 1ts equivalent may be added. "W on c extrin is present as one of the ingredients, the proportions are :8 5 one ound, more or less dcxtrin to one hundre pounds, more or less, of dr material. 1 I

' If the material is to be used m5 work, where it will be ex osed to changing tem eratures and to all kinds of weather, it 9 is o advantage to use a binder consisting of cement and gypsum in owdered form in p n. Tl"? "wag a more or less, 2% and one-third, more or less sum. 1f? uhldmg material such as described is fireproof and weatherproof. It is further characterized by great tensile and compressive strength and extreme lightness in respect to bulk. For example, a block of the dimen- 1 O0 sions of an ordinary red brick possesses about half the weight of the latter and will resist a far greater crushing strain. Another feature of the new material is that when plastic it can be molded to any form or shape and when TO 5 hard it can be sawed and worked with the same facility as timber.

It will be obvious to those skilled in the art to which the invention appertains that modifications may be made in detail without I 10 {15% at r 4 ijp f fz/zfl, /W60 [512) Q, ;w,-,.m. 7

W r/i/l able binder, a material to accelerate hardening, a filler consisting principally of ground or comminuted coal, clinkers, and ashes, and

in presence of a glazing medium, substantially as s ecified.

3. Building material consisting of t e prod- J4A/J7A777Q not of a mixture of cement and gypsum, sand, a material to accelerate hardening, Water containing glazing materials in solution, and ground or comminuted coal, clinkers, and ashes, substantially as specified.

4. Building material consisting of the product of a mixture of cement and gypsum, sand, a material to accelerate hardening, ground or commgiuted coal, clinkers, and ashes, and waterY-ontaining in solution glazing material res onsive to heat, substantially as specified.

n testimony whereof I affix my signature 0 two witnesses.

MARK W. MARSDEN.

Witnesses;

JAS. A. RICHMOND, ARTHUR E. DowELL.

i s44 er W QM. 5.2a 

